Mathematics
NULL
Medium
Question
A tanker is filled by A in 60 min and B in 40 min. Using B alone for half the time and A+B for the other half, minutes needed from empty are?
A
15 min
B
20 min
C
27.5 min
D
30 min
✓ Official correct answer
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A
15 min
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B
20 min
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C
27.5 min
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D
30 min
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Explanation
Each half lasts 15 min ⇒ total 30 min.